BSlobodkin

I can also vouch for HaSofer. I have dealt with the staff, and they are extremely ehrlich and knowledgeable. Another highly reputed tefillin dealer to add to the list is Rabbi Shmuel Rosenfeld (Min HaSTam). He has a shop in Geula/Meah Shearim. He doesn’t sell online, but you can order his tefillin gassos online at Ben’s Tallit Shop, which is also based in Yerushalayim.